netdev - Re: [PATCH net] net: openvswitch: free vport unless register

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Message-ID: <20191023022053.0669e33f@elisabeth>
Date:   Wed, 23 Oct 2019 02:20:53 +0200
From:   Stefano Brivio <sbrivio@...hat.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     David Miller <davem@...emloft.net>,
        Hillf Danton <hdanton@...a.com>,
        Taehee Yoo <ap420073@...il.com>,
        Greg Rose <gvrose8192@...il.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Ying Xue <ying.xue@...driver.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Pravin B Shelar <pshelar@....org>,
        syzkaller-bugs@...glegroups.com,
        syzbot <syzbot+13210896153522fe1ee5@...kaller.appspotmail.com>,
        Jiri Benc <jbenc@...hat.com>,
        Eelco Chaudron <echaudro@...hat.com>, netdev@...r.kernel.org,
        dev@...nvswitch.org
Subject: Re: [PATCH net] net: openvswitch: free vport unless
 register_netdevice() succeeds

Hi Jakub,

On Tue, 22 Oct 2019 14:53:16 -0700
Jakub Kicinski <jakub.kicinski@...ronome.com> wrote:

> On Mon, 21 Oct 2019 12:01:57 +0200, Stefano Brivio wrote:
> > From: Hillf Danton <hdanton@...a.com>
> > 
> > syzbot found the following crash on:  
>  
> > The function in net core, register_netdevice(), may fail with vport's
> > destruction callback either invoked or not. After commit 309b66970ee2,  
> 
> I've added the correct commit quote here, please heed checkpatch'es
> warnings.

I disregarded this warning as it looks redundant to me, given that the
full commit quote is already given in the Fixes: tag below.

In this specific case, I guess it doesn't really make a difference, but
sometimes one needs to mention the same commit multiple times in the
actual message, and while checkpatch would complain about every single
instance, I think that providing the full quote for each of them isn't
very useful and hinders readability.

> > Reported-by: syzbot+13210896153522fe1ee5@...kaller.appspotmail.com
> > Fixes: 309b66970ee2 ("net: openvswitch: do not free vport if register_netdevice() is failed.")
> > Cc: Taehee Yoo <ap420073@...il.com>
> > Cc: Greg Rose <gvrose8192@...il.com>
> > Cc: Eric Dumazet <eric.dumazet@...il.com>
> > Cc: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
> > Cc: Ying Xue <ying.xue@...driver.com>
> > Cc: Andrey Konovalov <andreyknvl@...gle.com>
> > Signed-off-by: Hillf Danton <hdanton@...a.com>
> > Acked-by: Pravin B Shelar <pshelar@....org>
> > [sbrivio: this was sent to dev@...nvswitch.org and never made its way
> >  to netdev -- resending original patch]
> > Signed-off-by: Stefano Brivio <sbrivio@...hat.com>
> > ---
> > This patch was sent to dev@...nvswitch.org and appeared on netdev
> > only as Pravin replied to it, giving his Acked-by. I contacted the
> > original author one month ago requesting to resend this to netdev,
> > but didn't get an answer, so I'm now resending the original patch.  
> 
> Applied and queued for 4.14+, thanks!

Thank you!

-- 
Stefano